Panel structure for loudspeaker and loudspeaker assembly comprising panel structure

Abstract

The invention discloses a panel structure for a loudspeaker and a loudspeaker assembly comprising the panel structure, and relates to the technical field of automobile loudspeakers, the panel structure comprises a central part, an edge part, a plurality of protruding parts and a plurality of bottom plate parts, the protruding parts are located between the central part and the edge part, and the bottom plate parts are located between the central part and the edge part. The protruding parts surround the center part and are sequentially arranged in the direction from the center of the center part to the edge part, interval grooves are formed between the center part, the protruding parts and the edge part which are sequentially adjacent, and the bottom plate parts are arranged in the interval grooves respectively. A hole is formed between the forward surface of the bottom plate part and the backward surface of the protruding part, the forward end of the outer edge area of the center part, the forward end of the inner edge area of the edge part and the forward end of at least one edge area of the protruding part are each provided with a first chamfer, and accumulation of muddy water and other sundries is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive speakers, and particularly to a panel structure for a speaker and a speaker assembly including the panel structure. Background Art

[0002] A speaker is an electroacoustic transducer that converts an electrical signal into mechanical vibration and then generates sound waves. Its core principle is based on electromagnetic induction and vibration theory. A speaker usually consists of a diaphragm, a voice coil, a magnet component, a suspension frame, and a spider. The principle is that an audio signal is transmitted to the voice coil through a power amplifier. The change in the voice coil current generates an alternating magnetic field, which interacts with the permanent magnet to drive the voice coil to vibrate. The voice coil drives the diaphragm to vibrate, compressing the air to form sound waves.

[0003] An external vehicle speaker refers to a speaker system installed outside the vehicle for playing sound into the external environment, usually set at positions such as bumpers, grilles, and chassis. Currently, with the popularization of electric vehicles and intelligent vehicles, external vehicle speakers are becoming increasingly important.

[0004] The core principle of an external vehicle speaker is similar to that of an internal vehicle speaker, both based on electromagnetic induction vibration to generate sound. However, due to different usage scenarios, their designs are also different. Especially in terms of waterproof and dustproof, a grille is usually set at the outer end of the speaker, mainly for protecting the inside of the speaker and optimizing the acoustic performance. Its design will directly affect sound propagation, dustproof, and waterproof capabilities. Currently, the existing grilles include structures such as mesh grilles, strip grilles, and 3D stereoscopic grilles. In actual situations, the above grille designs cannot achieve a better sound pressure level. Moreover, when in contact with rainwater, the grille setting will also cause the accumulation of mud and other debris. The above phenomena have become problems to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a panel structure for a speaker and a speaker assembly including the panel structure to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A panel structure for a speaker includes a central part, an edge part, a plurality of protruding parts, and a plurality of bottom plate parts. The central part is located at the middle position of the panel structure, the edge part is located at the edge position of the panel structure, the plurality of protruding parts are located between the central part and the edge part, the plurality of protruding parts surround the central part and are arranged in sequence in the direction from the center of the central part to the edge part, and intervals are respectively formed between the central part, the plurality of protruding parts, and the edge part in sequence.

[0007] A number of bottom plate parts are respectively arranged in a number of spaced grooves, and there is a pore between the front surface of the bottom plate part and the rear surface of the protruding part. Among them, the front end of the outer edge area of the central part, the front end of the inner edge area of the edge part, and the front end of at least one edge area of the protruding part are each provided with a first chamfer, and the rear end of at least one edge area of the bottom plate part closest to the central part and the rear end of the inner edge area of the bottom plate part closest to the edge part are each provided with a second chamfer;

[0008] A number of strengthening parts are arranged between the central part and the edge part. The strengthening parts are arranged along the direction from the center of the central part to the edge area of the edge part. The strengthening parts penetrate and connect a number of bottom plate parts and are fixed to the rear surface of the protruding part.

[0009] The present invention further illustrates that the front surface of the central part, the front surface of the protruding part, and the front surface of the edge part are located in the same plane; the rear surface of the bottom plate part and the rear surface of the edge part are located in the same plane.

[0010] The present invention further illustrates that the parameters of the panel structure include the number n of a number of protruding parts, the pore spacing L of the pores, and the central diameter d of the central part. The unit of the pore spacing and the central diameter is millimeter;

[0011] where 2 ≤ n ≤ 7 and n is an integer.

[0012] The present invention further illustrates that the calculation model Trans-rate of the porosity of the panel structure is;

[0013] Trans_rate → 4.15·δ 0.983 ·d 0.172 +Δε;

[0014] → means approaching; δ is a comprehensive coefficient, set δ = n·L, δ and d each take a value; Δε is a selectable compensation coefficient, taking [-1.10, 1.10]; after obtaining the value of Trans-rate, assign a percentage.

[0015] The present invention further illustrates that the panel structure has multiple groups of data sets, and each group of data sets is denoted as C i {δ, d, Δε|Trans-rate_al}, i takes 1 to m, m is the total number of data sets, and i is the label number of the data set;

[0016] δ, d, and Δε are respectively the comprehensive coefficient, central diameter, and selectable compensation coefficient recorded in the corresponding data set, and Trans-rate_al is the original porosity value measured in advance in the data set; Trans-rate_al is the original porosity value measured in advance in the data set.

[0017] The present invention further illustrates the relationship between the porosity Trans-rate and the sound pressure level SPL;

[0018] S = s + §·log 10 Trans-rate - k·h - M;

[0019] The sound pressure level emitted by the speaker after having the panel structure is denoted as S, and the sound pressure level emitted by the speaker after removing the panel structure is denoted as s, with the unit being dB. § is the value of the dielectric number, k is the material coefficient, k ranges from 0.2 to 0.4, h is the material thickness with the unit of millimeters; M is the set additional loss, ranging from 0 to 3 dB.

[0020] The present invention further illustrates that a speaker assembly including the above panel structure further includes a body structure and a diaphragm structure. The panel structure is embedded in the front end of the body structure along the central axis direction of the body structure, and the diaphragm structure is installed in the space formed by the connection of the panel structure and the body structure.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By setting a first chamfer at the protruding part, opening a second chamfer at the bottom plate part, and canceling the support and strengthening rib structure on the front surface of the panel structure, the sound pressure level of sound wave transmission is effectively improved, and the surface mud and water can flow downward unobstructed, which can effectively reduce the accumulation rate of mud and water and other sundries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0023] Figure 1 is the overall structural schematic diagram of the original panel structure of the present invention;

[0024] Figure 2 is the present invention Figure 1 of the split structural schematic diagram;

[0025] Figure 3 is the improved structural schematic diagram of the panel structure of the present invention;

[0026] Figure 4 is the exploded structural schematic diagram of the improved panel structure of the present invention;

[0027] Figure 5 is the present invention Figure 4 of the rear view structural schematic diagram;

[0028] Figure 6 is the sectional structural schematic diagram of the improved panel structure of the present invention;

[0029] Figure 7 is the present invention Figure 6 of the enlarged structural schematic diagram of area A;

[0030] Figure 8 is a schematic enlarged view of the B-region structure of the present invention Figure 7 ;

[0031] In the figure: 1. Panel structure; 101. Central part; 102. Protruding part; 103. Edge part; 104. Bottom plate part; 105. Reinforcing part; 106. Porosity; 2. Vessel structure; 201. First cover plate; 202. Support basin frame; 203. Second cover plate; 204. Dust cover; 205. Centering support piece; 206. Voice coil; 3. Diaphragm structure. Specific embodiments

[0032] The technical solution of the present invention will be further described in detail and non-limitingly below in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1, please refer to Figure 1 - Figure 2 , the present invention provides a technical solution: a speaker assembly, including a panel structure 1, a vessel structure 2 and a diaphragm structure 3. The panel structure 1 is embedded in the front end of the vessel structure 2 along the central axis direction of the vessel structure 2, and the panel structure 1 is in a circular grid shape; a diaphragm structure 3 is installed in the space formed by the connection of the panel structure 1 and the vessel structure 2, and the diaphragm structure 3 is in a conical shape; among them, referring to Figure 4 - Figure 6 , the vessel structure 2 includes a first cover plate 201, a support basin frame 202, a second cover plate 203, a dust cover 204, a centering support piece 205, and a voice coil 206 arranged in sequence along its central axis direction, Figure 4 is an exploded view of the assembly, Figure 6 showing a schematic cross-sectional structure of the vessel structure 2 in the installed state;

[0034] Specifically, the support basin frame 202 is installed inside the first cover plate 201. One end of the support basin frame 202 close to the first cover plate 201 is set as a hollow cylinder, and one end of the support basin frame 202 away from the first cover plate 201 is set as a cone consistent with the opening direction of the diaphragm structure 3; a magnet component is arranged at one end of the voice coil 206 located inside the cylinder, and a fine copper wire is wound around the surface of the voice coil 206. When the voice coil 206 is powered on, an electromagnet structure is formed, which can react with the magnet part and can change the direction and magnitude of the magnetic field by adjusting the direction and magnitude of the current; the circumferential side of the middle position of the voice coil 206 is fixed by the centering support piece 205, the dust cover 204 is fixedly connected to one end of the voice coil 206 close to the panel structure 1, and the middle part of the diaphragm structure 3 is connected to the surface of the voice coil 206;

[0035] After the first cover plate 201 and the second cover plate 203 are fixed by threads, the parts of the support basin frame 202, the centering support piece 205 and the voice coil 206 that are away from the dust cover 204 and the diaphragm structure 3 are installed between the first cover plate 201 and the second cover plate 203; wherein the dust cover 204 is used to prevent dust from entering the interior of the component. When the speaker is turned on, the voice coil 206 will transmit vibrations to the diaphragm structure 3, and the diaphragm structure 3 will vibrate accordingly and generate sound waves, thereby realizing the amplification of the audio signal and the sound transmission of the speaker.

[0036] Further, referring to Figure 3 , in this embodiment, the panel structure 1 is improved, and the original X-shaped reinforcing ribs are cancelled. Figure a shows the panel structure 1 with the original X-shaped reinforcing ribs, and Figure b shows the improved panel structure 1;

[0037] Referring to Figure 4 - Figure 8 , the panel structure 1 includes a central part 101 located in the middle position and an edge part 103 located in the edge position. A plurality of sets of protruding parts 102 are arranged in sequence around the central part and in the direction from the center of the central part 101 to the edge part 103. Spacing grooves are respectively formed between the central part 101, the plurality of protruding parts 102 and the edge part 103 in sequence. The number of the protruding parts 102 is denoted as n, and n + 1 spacing grooves are formed, which are set as reinforcing rib structures to strengthen the strength of the panel structure 1. The front surfaces of the central part 101, the protruding parts 102 and the edge part 103 are located in the same plane;

[0038] A plurality of bottom plate parts 104 are respectively arranged in the plurality of spacing grooves. The rear surfaces of the bottom plate parts 104 are located in the same plane as the rear surface of the edge part 103; there is a pore 106 between the front surface of the bottom plate part 104 and the rear surface of the protruding part for the sound to pass out, wherein the pore spacing is denoted as d;

[0039] A plurality of strengthening parts 105 are arranged between the central part 101 and the edge part 103. The strengthening parts 105 are arranged in the direction from the center of the central part 101 to the edge area of the edge part 103. The strengthening parts 105 penetrate and connect the plurality of bottom plate parts 104 and are fixed to the rear surfaces of the protruding parts 102, thereby realizing the connection between the various structures in the panel structure 1 and strengthening the support strength of the panel structure 1.

[0040] The widths of the plurality of protruding parts 102 and the widths of the plurality of bottom plate parts 104 both decrease gradually from the inside to the outside;

[0041] At least one front end of the outer edge area of the central part 101, at least one front end of the inner edge area of the edge part 103, and at least one front end of the edge area of the protruding part 102 are each provided with a first chamfer. At least one rear end of the edge area of the bottom plate part 104 closest to the central part 101 and at least one rear end of the inner edge area of the bottom plate part 104 closest to the edge part are each provided with a second chamfer. Through the unsupported structure on the front surface of the panel structure 1 and the chamfer design on the front and rear surfaces, rainwater, mud and other sundries can flow downward more smoothly when passing through the panel structure 1, reducing the accumulation rate of sundries. Further, the panel structure 1 is made of moisture-proof materials, including but not limited to acrylonitrile-butadiene-styrene copolymer (Acrylonitrile Butadiene Styrene, ABS resin material), nylon, aluminum alloy, stainless steel, and has good waterproof and moisture-proof performance.

[0042] Example 2, based on the structural settings in Example 1, the correlation between various parameters inside the panel structure 1 and the air permeability is constructed.

[0043] The original calculation formula for air permeability is usually the ratio of the area of the ventilation holes to the radiation area, expressed as a percentage. However, this calculation only discloses the relationship between the area of the ventilation holes and the radiation area, and the process of collecting the area is relatively complex. Now, a new air permeability calculation model will be established to show the connection with various parameters on the panel structure 1.

[0044] The new air permeability in the model is denoted as Trans_rate, where the number of protruding parts 102 is denoted as n, preferably an integer in 2 ≤ n ≤ 7, the pore spacing is denoted as L, with the unit of millimeter, and the central diameter of the central part 101 is denoted as d, with the unit of millimeter. The calculation model is as follows:

[0045] Trans_rate → 4.15·δ 0.983 ·d 0.172 +Δε

[0046] → means approaching; δ is a comprehensive coefficient, δ = n·L, δ takes a numerical value; d takes a numerical value; Δε is a selectable compensation coefficient, usually taking [-1.10, 1.10]; after obtaining the numerical value of Trans_rate, assign a percentage to ensure the meaning of the new air permeability; among them, the comprehensive coefficient is the primary influencing factor for the model calculation result, and the central diameter is the secondary influencing factor for the model calculation result.

[0047] After the calculation model is established, the panel structure 1 has multiple sets of data sets for testing multiple sets of data sets.

[0048] Each set of data sets is denoted as C i{δ, d, Δε|Trans-rate_al}, where i ranges from 1 to m, m is the total number of datasets, and i is the label serial number of the dataset; δ, d, and Δε are the comprehensive coefficient, central diameter, and selectable compensation coefficient recorded in the corresponding dataset respectively, and Trans-rate_al is the original clearance rate value measured in advance in the dataset;

[0049] During the test, for n and L in δ, n takes the values 2, 3, 4, 5; L takes the values 0.3, 0.5, 0.8, 1.0, 1.3, 1.5, d takes the values 8, 11, 13, 20, 30; Exemplarily, Table 1 below is the comparative analysis table of the model test results and the original results;

[0050] Table 1 Comparative Analysis Table of Model Test Results and Original Results

[0051]

[0052]

[0053] Under the compensation effect of the compensation coefficient, the error between the model test result and the original result can be reduced; In addition, during multiple tests, the compensation coefficient and the accuracy of the model output result are continuously optimized;

[0054] It should be noted that in this embodiment, the test is carried out at medium and high frequencies, and the preferred frequency range is 1.8 kHz - 3.5 kHz.

[0055] Example 3, based on the model of Example 2, the relationship between the clearance rate Trans-rate and the sound pressure level SPL (Sound Pressure Level) is determined to ensure the sensitivity of the sound transmitted by the speaker.

[0056] The sound pressure level emitted by the speaker after having the panel structure 1 is denoted as S, and the sound pressure level emitted by the speaker after removing the panel structure 1 is denoted as s, with the unit denoted as dB. Then S = s + §·log 10 Trans-rate - k·h - M; § is the value of the mesomeric number, taking values from 0 to 10, preferably 5;

[0057] Among them, k is the material coefficient, which is related to the acoustic characteristics. The material coefficient of metal is significantly higher than that of plastic. When choosing injection-molded ABS as the material of the panel structure 1, k takes values from 0.2 to 0.4; h is the material thickness, with the unit of millimeters; M is the set additional loss, ranging from 0 to 3 dB; Table 2 below is the data table of the speaker at 1.8 kHz; Table 3 below is the data table of the speaker at 1.8 kHz;

[0058] Table 2 Data Table of the Speaker at 1.8 kHz

[0059]

[0060]

[0061] Table Data sheet of the speaker at 33.5 kHz

[0062]

[0063] When the frequency increases, the sound pressure level generated by the speaker unit also increases; in the above example, h is taken as 4, k is taken as 0.3, and M is selected as an appropriate value according to the Trans-rate value, showing a positive correlation.

[0064] According to the above formula, the sound pressure level emitted by the speaker with a grille is significantly related to the new transmission rate. According to the formula content, relatively similar sound pressure level data can be quickly obtained in the medium and high frequency bands without the need for sound pressure testing, simplifying the testing process.

[0065] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A panel structure for a speaker, characterized in that: The said panel structure (1) comprises: A central part (101), which is located at the middle position of the panel structure (1); An edge part (103), which is located at the edge position of the panel structure (1); A number of protruding parts (102), which are located between the central part (101) and the edge part (103), and the number of protruding parts (102) are arranged in sequence around the central part (101) in the direction from the center of the central part (101) towards the edge part (103). An interval groove is respectively formed between the central part (101), the number of protruding parts (102) and the edge part (103) adjacent to each other in sequence; A number of bottom plate parts (104), which are respectively arranged in the number of interval grooves. A pore (106) is arranged between the forward surface of the bottom plate part (104) and the backward surface of the protruding part (102). Among them, a first chamfer is respectively opened at the forward end of the outer edge area of the central part (101), the forward end of the inner edge area of the edge part (103) and at least one edge area of the protruding part (102). A second chamfer is respectively opened at the backward end of at least one edge area of the bottom plate part (104) closest to the central part (101) and the backward end of the inner edge area of the bottom plate part (104) closest to the edge part; and A number of strengthening parts (105), which are arranged between the central part (101) and the edge part (103), and the strengthening parts (105) are arranged along the direction from the center of the central part (101) towards the edge area of the edge part (103). The strengthening parts (105) penetrate and connect the number of bottom plate parts (104) and are fixed to the backward surface of the protruding part (102).

2. The panel structure according to claim 1, wherein: The forward surface of the central part (101), the forward surface of the protruding part (102) and the forward surface of the edge part (103) are located in the same plane; The backward surface of the bottom plate part (104) and the backward surface of the edge part (103) are located in the same plane.

3. The panel structure according to claim 1, wherein: The widths of the number of protruding parts (102) and the widths of the number of bottom plate parts (104) both decrease successively from inside to outside.

4. The panel structure according to claim 1, wherein: The panel structure (1) is made of moisture-proof material.

5. The panel structure according to any one of claims 1-4, characterized in that: The parameters of the panel structure (1) include the number n of the number of protruding parts (102), the pore spacing L of the pore (106), and the central diameter d of the central part (101). The unit of the pore spacing and the central diameter is millimeter; where 2 ≤ n ≤ 7 and n is an integer.

6. The panel structure according to claim 5, characterized in that: The calculation model Trans_rate of the porosity of the panel structure (1) is; Trans_rate → 4.15·δ 0.983 ·d 0.172 +Δε; → represents approaching; δ is a comprehensive coefficient, set δ = n·L, and δ and d each take a value; Δε is a selectable compensation coefficient, taking [-1.10, 1.10]; after obtaining the value of Trans_rate, assign a percentage.

7. The panel structure according to claim 6, wherein: The panel structure (1) has multiple sets of data sets, and each set of the data sets is denoted as C i {δ, d, Δε|Trans-rate_al}, where i ranges from 1 to m, m is the total number of the data sets, and i is the label serial number of the data sets; δ, d, and Δε are the comprehensive coefficient, central diameter, and selectable compensation coefficient recorded in the corresponding dataset respectively, and Trans-rate_al is the original clearance rate value measured in advance in the dataset.

8. The panel structure according to claim 7, wherein: The relationship between the clearance rate Trans_rate and the sound pressure level SPL; S = s + §·log 10 Trans_rate - k·h - M; The sound pressure level emitted by the loudspeaker after having the panel structure (1) is denoted as S, and the sound pressure level emitted by the loudspeaker after removing the panel structure (1) is denoted as s, with the unit being dB, § is the value of the dielectric number, k is the material coefficient, k ranges from 0.2 to 0.4, h is the material thickness with the unit of millimeters; M is the set additional loss, ranging from 0 to 3 dB.

9. A speaker component, comprising the panel structure according to claim 8, characterized in that: It further includes a body structure (2) and a diaphragm structure (3). The panel structure (1) is embedded in the front end of the body structure (2) along the central axis direction of the body structure (2), and the diaphragm structure (3) is installed in the space formed by the connection of the panel structure (1) and the body structure (2).

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